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  1. Qt
  2. QTBUG-100564

Screen cloning with eglfs_kms does not work on Raspberry Pi 4

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    Details

    • Type: Bug
    • Status: Reported
    • Priority: P2: Important
    • Resolution: Unresolved
    • Affects Version/s: 5.15.8
    • Fix Version/s: None
    • Component/s: QPA: EGLFS
    • Environment:
      Boot2Qt / Raspberry Pi 4
    • Platform/s:
      Linux/Yocto

      Description

      When cloning the screen output by setting QT_QPA_EGLFS_KMS_CONFIG the following error occurs when manipulating the screen causing a re-rendering of the scene.

      QEGLPlatformContext: eglSwapBuffers failed: 3003
      Could not lock GBM surface front buffer!

       

      QT_QPA_EGLFS_KMS_CONFIG:

      {
       "device": "/dev/dri/card1",
       "hwcursor": true,
       "outputs": [
       { 
       "name": "HDMI1",
       "mode": "1280x800",
       "mouseDevice": "/dev/input/mouse0"
       },
       { 
       "name": "HDMI2",
       "mode": "1280x800",
       "clones": "HDMI1"
       }
       ]
      }
      

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            Assignee:
            lagocs Laszlo Agocs
            Reporter:
            tuomas.vaarala Tuomas Vaarala
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              Dates

              Created:
              Updated:

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